Dyestuffs of the anthraquinone series



Patented Aug. 8, 1939 UNITED STATES PATENT OFFICE DYESTUFFS OF THE ANTHRAQUINONE SERIES Werner Zerweck and Ernst Heinrich, Frankfort on-the-Main-Fechenheim, Germany, assig'nors to General Aniline N. Y., a corporation Works, Inc., New York,

of Delaware No Drawing. Application January 27, 1938, Se-

rial No. 187,156. In Germany February 4,

4 Claims.

wherein Y stands for a member of the group consisting of hydrogen and alkyl, X for a member of the group consisting of hydrogen and methyl and R represents a member of the group consisting of hydrogen, an alkoxy-, carboxyamideand sulfonic acid group.

The new dyestuffs may be obtained for instance by acting With isopropylamine or isobutylamine on an 1-amino-4-halogenoanthraquinone-Z-sulfonio acid or nuclear substitution products thereof and splitting off in a given case the sulfonic acid group standing in the 2-position or substituting it by an other monovalent group.

By a suitable selection of further substituents in the anthraquinone nucleus the properties of the dyestuffs formed can be varied in a farreaching manner. By introducing water solu- 3. bilizing groups into the anthraquin'cne nucleus valuable acid wool dyestuffs are obtained surpassing the known analogous dyestuffs by better fastness properties. For instance the present dyestuffs containing in the 4-position of the anthraquinone nucleus an isopropylaminoor a secondary butyl-amino-group and in the 2-position a sulfonic acid group are superior to the isomeric dyestufi containing a n-butylamino-group, owing to a substantially increased fastness to light. 40 Those of the present dyestuffs which do not contain water solubilizing groups may be used advantageously for dyeing and printing cellulose esters and ethers and they likewise surpass the known analogous dyestufis owing to better fastness properties. For instance l-aminol-isopropylamino-anthraquinone and l-amino-i-secondary butylamino-anthraquinone may be mentioned, which are superior to l-amino-l-methylamino-anthraquinone owing to an essentially better fastness to light.

In order to further illustrate our invention the following examples are given, the parts being by weight and all temperatures in degrees centigrade, but we wish it, however, to be understood that our invention is not limited to the examples given nor to theexact conditions stated therein.

Example 1 A mixture of 40 parts of the sodium salt of 1- amino-4=-bromoanthraquinone-2-sulfonic acid, 15 parts of isopropylamine, 10 parts of sodium carbonate, 4 parts of cuprous chloride and about 2000 parts of water is heated for about 8 hours at to From the blue reaction solution the 1-amino-4-isopropylaminoanthraquinone-2 sulfonic acid formed is isolated by adding sodium chloride. The dyestuff dyes wool clear blue shades fast to light and exhibits a good levelling power. It dissolves in concentrated sulfuric acid with a yellowish brown color turning to greenish blue after the addition of paraformaldehyde. The new dyestuif corresponds with the formula:

0 NHz ll l SOaH

CH3 NHCH is obtained, which dyes acetate silk pure and fast bluish violet shades. When heating in a closed vessel a mixture of 1-amino-4-isopropylaminoanthraquinone-Z-sulfonie acid and of an aqueous potassium cyanide solution the 1-amino-2-cya n 0 g e n 0 4 isopropylaminoanthraquinone is formed which can be saponified yielding the 1- amino-4-isoproplyamino-anthraquinone 2 carboxyamide of the formula:

0 ONE:

OHa O NH-GH This compound dyes acetate silk pure greenish blue shades of a good levelling power and fastness to light.

When boiling for some hours a solution of 1 amino-4-isopropylaminoanthraquinone-2-sulfonic acid, dissolved in ethylalcohol of 50% strength, the sulfonic acid group is replaced by the ethoxy group. The formed 1-amino-2-ethoxy-4-isopropylaminoanthraquinone of the for mula:

O NH;

II I

C H: O NHCH 40 parts of the sodium salt of l-aminoi-bromoanthraquinone-Z-sulfonic acid are condensed with 18 parts of secondary butylamine according to the details described in Example 1. In this manner the l-amino-4-secondary butylaminoanthraquinone-Z-sulfonic acid of the formula:

CH: O Nil-0 H GHQ-CH3 is formed, which dyes wool fast reddish blue shades. W'hen splitting off the sulfonic acid group for instance by treatment with glucose in an alkaline medium the l-amino-l-secondary butylaminoanthraquinone of the formula:

\l/ /C Hz is formed which dyes acetate silk somewhat reddish blue-violet shades fast to light.

Example 3 A mixture of 36 parts of l-benzoylamino-4- chloro-anthraquinone, parts of an aqueous solution of isopropylamine of 50% strength, about 375 parts of dioxan and 3 parts of cuprous acetate is heated for about 10 hours in a closed vessel at about When cool the separated 1 benzoylamino 4 isopropylamino-anthraqui none is isolated. From glacial acetic acid it crystallizes as violet needles of about 241 melting point. It dissolves in concentrated sulfuric acid with a reddish brown color turning to olive-green after the addition of paraformaldehyde.

By means of sulfuric acid of about 90% strength it is saponified while forming the 1- amino 4 isopropylaminoanthraquinone which crystallizes from monochlorobenzene as bronze colored crystals of about 180 melting point. It dissolves in concentrated sulfuric acid with a brownish red color turning to blue after the addition of paraformaldehyde, and dyes acetate silk as said above pure bluish violet shades of a good fastness particularly to light.

The above mentioned 1-benzoylamin0-4-ch1oroanthraquinone may be replaced by compounds containing instead of chlorine an other replaceable group such as the nitro or methoxy group.

Example 4 A mixture of 62 parts of the potassium salt of anthraquinone -1-sulfonic acid, 28 parts of the sodium salt of 3nitrobenzene-1-sulfonic acid, parts of an aqueous solution of isopropylamine of 50% strength and about 3000 parts of water is heated in a closed vessel for about 6 hours at about to The formed l-isopropylaminoanthraquinone is isolated. It crystallizes from glacial acetic acid as red needles of about 187 melting point. By treatment with bromine in the presence of glacial acetic acid the l-isopropylamino4bromoanthraquinone is formed, which crystallizes from dilute alcohol as red needles of about 120 melting point. The decomposition thereof by means of benzenesulfamide in the presence of nitro-benzene and cuprous acetate yields the l-isopropylamino-4-pheny1 sulfonylaminoanthraquinone and by saponifying the latter compound by means of suliuric acid the 1-amino-4-isopropylaminoanthraquinone.

When nitrating the l-isopropylaminoanthraquinone by means of nitric acid of 33 B. the 1isopropylarnino-4=nitroanthraquinone is formed, which yields by reduction with sodiumsulfide the l-amino-4-isopropylaminoanthraquinone.

Example 5 A mixture of 24 parts of 1,4-diamino-leucoanthraquinone, 24 parts of 1,4-dihydroxyanthraquinone, 50 parts of a solution of isopropylamine in isobutyl alcohol of 25% strength and about 350 parts of isobutylalcohol is heated in a closed vessel for about 60 hours at 90 to 100. Then the leuco-compound of the l-aminol-isopropylaminoanthraquinone which partly exists in the reaction mixture is oxidized by blowing in air into the mixture after the addition of 3 parts of cuprous acetate. By evaporating the isobutylalcoholic solution in vacuo the formed l-amino- 4-isopropylaminoanthraquinone separates in a crystalline form.

Example 6 A mixture of 400 parts of methanol, 150 parts of water, 24 parts of 1,4-diamino-1eucoanthraquinone, 30 parts of an aqueous solution of monomethylamine of 25% strength and 33 parts of an aqueous solution of isopropylamine of strength is heated to boiling for some hours. The formed yellowish brown solution of l-methylamino-4-isopropylamino-leucoanthraquinone is oxidised by blowing in air after the addition of 1 part of cuprous acetate. When cool the formed 1 methylamino-4-isopropylaminoanthraquinone of the formula:

wherein Y stands for a member of the group consisting of hydrogen and alkyl, X for a member of the group consisting of hydrogen and methyl and. R represents a member of the group consisting of hydrogen, an alkoxy-, carboxyamideand sulfonic acid group.

2. A dyestufi of the anthraquinone series of the formula:

0 NH: II I OH; I O NH- 0-H which dyestuff dissolves in concentrated sulfuric acid with a brownish red color turning to blue after the addition of paraformaldehyde and dyes acetate silk pure bluish violet shades of a good fastness particularly to light.

3. A dyestuff of the anthraquinone series of the formula:

0 NH: II I O O NH:

CH3 O NHOH which dyestuff dyes acetate silk pure greenish shades of a good levelling power and fastness to light.

4. A dyestuff of the anthraquinone series of the formula o IIIHCHa l 0 NHOH which dyestuff crystallizes from monochlorobenzene as bronze colored crystals melting at 216 to 217, dissolves in concentrated sulfuric acid with a yellowish brown color turning to blue after the addition of paraformaldehyde and dyes acetate silk fast reddish blue shades.

WERNER ZERWECK.

ERNST HEINRICH. 

